| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] [verb] a | 15588 |
|
| 2 | [not/n't] [been] [verb] | 4979 |
|
| 3 | [been] [verb] a | 2593 |
|
| 4 | [not/n't] [been] a | 359 |
|
